<!DOCTYPE HTML>
<html>
<head>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
</head>
<body>
<script>

WEBGL_TYPES = {};
WEBGL_TYPES['experimental-webgl'] = true;
WEBGL_TYPES['webgl'] = true;

function AreBothIn(a, b, set) {
    return (a in set) && (b in set);
}

function IsAlias(typeA, typeB) {
    if (typeA == typeB)
        return true;

    if (AreBothIn(typeA, typeB, WEBGL_TYPES))
        return true;

    return false;
}

function TestContextRetrieval(creationType, requestType, functionalTypeSet) {
    var canvas = document.createElement('canvas');
    var createdGL = canvas.getContext(creationType);

    var didCreationSucceed = (createdGL != null);
    if (creationType in functionalTypeSet) {
        ok(createdGL, 'Context creation should succeed for type \'' +
                      creationType + '\'');
    } else {
        ok(!createdGL, 'Context creation should fail for type \'' +
                       creationType + '\'');
        return;
    }

    var requestedGL = canvas.getContext(requestType);

    if (requestType in functionalTypeSet &&
        IsAlias(creationType, requestType))
    {
        ok(requestedGL, 'Request for \'' + requestType + '\' from \'' +
                        creationType + '\' should succeed.');
        ok(requestedGL == createdGL, 'Request for \'' + requestType +
                                     '\' from \'' + creationType +
                                     '\' should match.');
    } else {
        ok(!requestedGL, 'Request for \'' + requestType + '\' from \'' +
                         creationType + '\' should fail.');
    }
}

function IsWebGLFunctional() {
    var canvas = document.createElement('canvas');
    return canvas.getContext('experimental-webgl') != null;
}

function IsWebGLConformant() {
    var canvas = document.createElement('canvas');
    return canvas.getContext('webgl') != null;
}

var typeList = ['2d', 'experimental-webgl', 'webgl'];
var functionalTypeSet = {};
functionalTypeSet['2d'] = true;

if (IsWebGLFunctional())
    functionalTypeSet['experimental-webgl'] = true;

if (IsWebGLConformant())
    functionalTypeSet['webgl'] = true;

for (var i in typeList) {
    var creationType = typeList[i];

    for (var j in typeList) {
        var requestType = typeList[j];

        TestContextRetrieval(creationType, requestType, functionalTypeSet);
    }
}

</script>
</body>
</html>
